Chick-fil-A is one of the largest American fast food restaurant chains and the largest whose specialty is chicken sandwiches. Chick-fil-A operates more than 2,773 restaurants, primarily in the United States, with locations in 47 states and the District of Columbia.
Shake Shack is an American fast casual restaurant chain based in New York City. It started out as a hot dog cart inside Madison Square Park in 2001, and its popularity steadily grew. It currently has own and operates over 250 locations globally.
Smashburger is an American fast-casual hamburger restaurant chain founded in Denver, Colorado, the chain serves "smashed" burgers using a specialized process of cooking them on a flattop grill at a high heat. As of February 2018, it has more than 370 corporate and franchise-owned restaurants in 37 states and 9 countries.
Popeyes is an American multinational chain of fried chicken fast food restaurants that was founded in 1972 in New Orleans, Louisiana, as of 2020 Popeyes has 3,451 restaurants, which are located in more than 46 states and the District of Columbia, Puerto Rico, and 30 countries worldwide.
Wendy's is an American international fast food restaurant chain founded by Dave Thomas on November 15, 1969, in Columbus, Ohio. As of December 31, 2018, Wendy's was the world's third-largest hamburger fast-food chain with 6,711 locations.
Burger King (BK) is an American multinational chain of hamburger fast food restaurants. Headquartered in Miami-Dade County, Florida, as of December 31, 2018, Burger King reported it had 17,796 outlets in 100 countries, nearly half of these are located in the United States.